Can't sign into other accounts even though credentials are correct

Sorry to hear you're having issues. However, no one on the forums will be able to help you as what you are trying to do is against the ToU and CoC of the Live service that you agreed to when you created your account.

What you are trying to do is considered Marketplace Theft and could result in your gamertags and/or consoles being banned from the Live service completely.

it isn't that we don't WANT to help , we love having you play but credentials are very strictly controlled for security issues the email account doesn't need to be active to use the email and password to sign in but DOES need to be real and active if
you need to reset things. you can still try guessing even though you can't get support for lost credentials

Greetings cblskyline!

When you signed in to www.xbox.com, did you sign in using the credentials associated with the correct Microsoft account (email and password)?

Hi Brendan, thanks for reaching out. My name’s Aileen, and I’m an independent advisor here to help. Just a heads-up, this is a public forum, and I can’t access or make changes to your account.

From what you’ve shared, it sounds like your account may be caught in a security loop, likely due to a flagged sign-in attempt or recovery check from Microsoft’s side. Here’s what you can try:

Clear all saved logins on your browser or device (including cookies/cache).

Go to account.live.com and try logging in there first.

If prompted to change your password again, choose a brand-new one (not recently used).

After the password reset, use a private/incognito window to try signing in on Xbox.com or your console.

Once you're in, go to this page and check your recent activity. If anything looks unfamiliar, report it and update your security info.

If you’re still stuck in the login loop and can’t get past verification, your next step is to submit the account recovery form using this link:

https://account.live.com/acsr

Be as accurate as possible with past passwords, security answers, and linked accounts.

If you're using a work or school account, some of this won't apply. Let me know, and I’ll adjust the steps.

Please let me know if you need any further assistance. Looking forward to your response.

Hi there, WaxLemming32362.

We recommend double-checking that you're signing into your Xbox account with the correct account credentials. It's possible you may have accidentally created a new account by mistake when attempting to sign into your account.